I have two Unraid 6.12.3 machines (UR1 and UR2) that are serving as NFS servers and clients to each other. Today UR1 started giving NFS protocol errors and is unable to mount shares or otherwise 'see' UR2 via NFS.

 

The full error is

unassigned.devices: NFS mount failed: 'mount.nfs: requested NFS version or transport protocol is not supported '.

 

The only thing I’ve changed on both machines is to upgrade parity on UR1 and start a parity check, and UR2 had an array disk upgraded and also has a parity check running.

 

UR1 cannot mount anything NFS on UR2, throwing the protocol error.
UR2 has no problem mounting NFS on UR1.

 

Both machines have the Unassigned Devices plugin installed and at the latest version. I’ve tried stopping and starting the NFS service on both machines, without impact. I’ve changed the NFS settings on the individual shares to No and then back to Yes, also without impact.

 

A set of diagnostic files is enclosed from UR2, and I’m not sure where else to look to determine what settings are different on UR2 vs. UR1.

 

What am I missing?

Any help is appreciated.

utility-diagnostics-20230905-1947.zip

You have several issues:

• There is an issue with 6.12.3 with the version of NFS being mounted with UD.  Set the 'Settings->Unassigned Devices->Common Settings->NFS' Version to use to NFSv4.  This will have UD mount NFS devices with NFSv4.  This has been fixed in 6.12.4 and the setting can be set to 'Auto'.
• You have an issue with one of the servers being 'online':

  Sep  5 16:39:17 utility unassigned.devices: Remote server '10.10.0.2' is not responding to a ping and appears to be offline.

   

Thank you very much for the review and suggestions. I had rebooted UR1 during the day and left UR2 alone. Once I realized UR2 was due for a reboot as a resolution step for this, doing so did resolve the NFS connectivity issue. No other changes were needed. Once the parity checks are done on both devices, I'll upgrade each to 6.12.4.

 

Marked as solved.